Classify the following substances as: Pure Substance – Solution – Mechanical Mixture –

Suspension –

Milk

Coffee (black)

Soil

Sugar

Lemon juice

Salad Dressing

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.